Śatapatha Brāhmaṇa ("of a hundred paths") 3.4.3.1

3.4.3.1

ātithyena vai devā iṣṭvā | tāntsamadavindatte tānūnaptraiḥ samaśāmyaṃsta etasya prāyaścittimaicanyadanyo 'nyam pāpamavadannāha purāvabhṛthātpunardīkṣāmavākalpayaṃsta etāmavāntarāṃ dīkṣāmapaśyan

When the gods had performed the guest-offering, discord arose between them. They allayed it by means of the Tânûnaptra (oaths). They desired an atonement for having spoken evil to one another; for they had appointed no other consecration-ceremony till the expiatory bath. They perceived this intermediate consecration.